IS 15932-1: Selection and Use of various types of Lignocellulosic Panel Products - Code of Practice, Part 1: Medium Density Particle Boards

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IS 15932-1 (2012) : Selection and Use of various types of
Lignocellulosic Panel Products - Code of Practice, Part 1:
Medium Density Particle Boards [CED 20: Wood and other
Lignocellulosic products]

Satyanarayan Gangaram Pitroda
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IS 15932 (Parti): 2012

Indian Standard

SELECTION AND USE OF VARIOUS TYPES OF

LIGNOCELLULOSIC PANEL PRODUCTS —

CODE OF PRACTICE

PART 1 MEDIUM DENSITY PARTICLE BOARDS

ICS 79.060.20

© BIS 2012

BUREAU OF INDIAN STANDARDS

MANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG
NEW DELHI 110002

August 2012 Price Group 4

Wood and Other Lignocellulosic Products Sectional Committee, CED 20

FOREWORD

This Indian Standard (Part 1) was adopted by the Bureau of Indian Standards, after the draft finalized by the
Wood and Other Lignocellulosic Products Sectional Committee had been approved by the Civil Engineering
Division Council.

Particle boards are classified into three types based on their density as low density, medium density and high
density particle boards. All the three types of particle boards have specific application and usage. While low
density particle boards are used as ceiling tiles and display boards, high density particle boards are used for
specialized tools, in aircraft, automobile and general engineering industries; their usage however is only to a
limited extent. The most common type of particle boards being used is the medium density boards which find
extensive use in partitioning, in manufacture of doors, in manufacture of furniture, etc.

Over the past few years medium density particle boards have become one of the major products of growing
importance to furniture industry. In view of its construction and properties being different from that of wood,
especially with regard to carpentry work, the need to formulate a comprehensive Code for proper guidance to
industry and consumer in the selection and use of medium density particle board was felt.

This Code of practice is a guideline for use of medium density particle boards only. The Code may be read in
conjunction with IS 3087 : 2005 'Specification for particle boards of wood and other lignocellulosic materials
(medium density) for general purposes (second revision)'; IS 3097 : 2006 'Specification for veneered particle
boards (second revision)' and IS 12823 : 1990 'Specification for prelaminated particle boards'. This standard is
published in three parts. The other parts in the series are:

Part 2 Hardboards (under preparation)
Part 3 Fibreboards (under preparation)

In the formulation of this standard, due weightage has been given to standards and practices prevailing in the
country.

The composition of the Committee responsible for the formulation of this standard is given in Annex A.

IS 15932 (Part 1) : 2012

Indian Standard

SELECTION AND USE OF VARIOUS TYPES OF

LIGNOCELLULOSIC PANEL PRODUCTS —

CODE OF PRACTICE

PART 1 MEDIUM DENSITY PARTICLE BOARDS

1 SCOPE

This standard (Part 1) covers guidelines for use and
application of medium density particle boards widely
used in building interiors, cabinets, joinery, mass
produced furniture/wardrobes, kitchen cabinets,
shelving and storage units, partitions, door infill, work
stations, floor decking, temporary constructions and
mock ups. Particle boards are amenable to be used in
combination with wood, aluminium and steel external
frame work.

2 REFERENCES

The following standards contain provisions which
through reference in this text constitute provisions of
this standard. At the time of publication, the editions
indicated were valid. All standards are subject to
revision and parties to agreements based on this
standard are encouraged to investigate the possibility

of applying the most recent editions of the standards
indicated below;

IS No.

Title

3087 : 2005 Particle boards of wood and other

lignocellulosic materials (medium
density) for general purposes —
Specification {second revision)

3097 : 2006 Veneered particle boards —

Specification {second revision)

12823 : 1990 Prelaminated particle boards from
wood and other lignocellulosic
material — Specification

3 GRADE AND GRADE SELECTION

3.1 Grades

The medium density particle boards shall be selected
from the following grades/types:

SI No.

Type of Board

Grade/Type

Designation

IS No.

i)

Medium density particle
board for general purposes

ii)

Prelaminated particle boards

iii) Veneered particle boards

Flat pressed, single layer

EPS

Extrusion pressed.

solid

XPS

Extrusion pressed.

tubular

XPT

Flat pressed, multilayer:

a) Grade I

FPTl

b) Grade II

FPT2

Grade I:

a) Type I

PLB 11

b) Type II

PLB 12

c) Type III

PLB 13

d) Type IV

PLB 14

Grade II:

a) Type I

PLB 21

b) Type II

PLB 22

c) Type III

PLB 23

d) Type IV

PLB 24

Grade I:

a) Type 1

SOGP-I

b) Type 2

SOD-I

c) Type 3

TUGP-I

d) Type 4

TUD-I

Grade II:

a) Type 1

SOGP-II

b) Type 2

SOD-II

c) Type 3

TUGP-II

d) Type 4

TUD-II

IS 3087

IS 12823

IS 3097

IS 15932 (Part 1) : 2012

3.2 Grade Selection

All the above grades of particle boards with the
exception of tubular veneered particle boards, are
suitable for use in interior dry locations or in air
conditioned environments. For hazard Class 1
environments only Grade I prelaminated or Grade I
veneered particle boards shall be used (phenolic resin
bonded).

Particle boards of different grades presently
manufactured in the country are not suitable for
exposed/out door conditions or for interiors with high
moisture and wet conditions.

NOTE — Hazard Class 1 environment have relative humidity
less than or equal to 70 percent.

4 STRUCTURAL CONSIDERATIONS

4.1 Particle board like other board has relatively low
bending strength (modulus of rupture, MOR) and low
stiffness (modulus of elasticity, MOE) as compared to
wood or plywood. It also possesses high inplane
rigidity which makes it ideal for box like constructions
(cabinets). Combining particle board with wood or
metal framework can overcome the limitations in
bending strength and stiffness of the material.

4.2 Fastener like wood screws and nails are generally
not suitable for making joints in particle boards as they
have a tendency to split the board when screwed or
nailed edgewise. A wide variety of fasteners like
particle board screws and connectors to improve the
jointing efficiency in particle boards are available {see
also 6).

4.3 Where stiffness is the main consideration as in
shelving, storage units and floor decking, the load
bearing capacity for a given thickness of particle board
for uniformily distributed loading condition depends
upon the MOE of the material and is given by;

32 bt'd
W= :—E

where

W = total load (uniformly distributed), in kg;

b = width of shelf, in mm;

t = thickness of board, in mm;

d = deflection at the centre, in mm;

L = distance between two supports (span), in
mm; and

E = modulus of elasticity, in N/mm^.

The deflection in shelves may be restricted to between
span/200 to span/240.

Due to creeping behaviour of particle boards under
varying humidity condition and sustained load effect,
the load bearing capacity may be reduced by 20
percent.

For continuously supported conditions (supported on
two or more supports), the load bearing capacity of
the boards may be increased by twice the value arrived
at by the above formula.

5 JOINTING/FASTENING TECHNIQUES

5.1 The principal use of medium density particle board
is in the manufacture of factory produced cabinets and
furniture. Besides, medium density particle board is
also used as infill panels where plain or prelaminated/
veneered particle boards are inserted in wood or metal
frames. Medium density particle board is also used as
a cladding material in building interiors where boards
are directly screwed to wood or metal framework.

5.2 In cabinet construction/panel furniture/storage
units, particle boards have to be joined at right angles
forming 'L' or 'T' joints. The joints have to be suitably
detailed depending on the appearance.

Common corner joints ('L' joints) suitable for particle
board are butt, mitre, lap and bare faced housing as
shown in Fig. 1. These joints have to be further
strengthened with the help of connectors, dowels or
loose tongue in combination with adhesives. Special
knock downs are also available for making butt joints
especially in mass productions and do-it-yourself
furniture and cabinets. T-joints are also detailed on
similar lines as shown in Fig. 2.

5.3 Specially made screws, dowels, loose tongue and
special hardware and adhesives are additionally used
to strengthen joints. Manufacturer's instructions should
be followed in use of these hardwares.

5.4 Joints usually used in wood work such as mortise
and tenon, dovetail and box, are not suitable for
working with particle board and other panel materials
due to splitting tendency and low tensile strength of
these material. These types of joints should be avoided.

5.5 End to end joints in particle boards can be used to
increase the width or length. Tongue and groove, loose
tongue and dowels are suitable for making end joints
as shown in Fig. 3.

IS 15932 (Part 1) : 2012

Butt Joint
(Edge Exposed)

Mitre Joint
(Concealed Edge)

Lap Joint
(Partially Concealed Edge)

Fig. 1 L-JoiNTS

Bare Faced
Housing Joint
(Exposed)

c

Butt Joint

Housing Joint

Bare Faced
Housing Joint

Mechanical Support

Fig. 2 T- Joints

I

Tongue and Groove Joint

Loose Tongue Joint

Dowel Joint

Fig. 3 End Joints

6 FASTENERS FOR PARTICLE BOARD

6.1 Particle boards have different structure as compared
to wood. Layered or graded construction used in the
manufacture of boards make them vulnerable to
splitting when screwed or nailed. It is always safe to
screw through the face of the board and specially made
hardwares are designed to follow this rule.

6.2 Wood screws do not provide required withdrawal
strength for making strong joints in particle boards.
As an alternative, fully threaded self tapping or twin
threaded screws provide better holding in joints. These
types of screws facilitate easy screwing without

splitting the board. These types of screws can be used
in strengthening 'T' and 'L' joints.

6.3 As a general rule suitable shank diameter (size) of
the screw equivalent to one-fifth of the thickness of
the board to be joined can be selected. Length of the
screws can be two and a half to three times the thickness
of the board in 'L' and 'T' joints.

6.4 Pilot holes are required for any type of screws, through
the face into the edge of the board. As a rule pilot hole
diameter could be 80 percent of the shank diameter of
the screw. Normally screw heads can either be countersunk
or concealed with specially made decorative covers.

6.5 Strong joints can be achieved by inserting threaded
nylon plugs/inserts into pre-drilled holes in the edge of
the board and ordinary wood screws can be driven to
make straight strong comer or 'T' joints as shown in Fig. 4.

6.6 Specially made screw connectors, coarse threaded
are also used in the manufacture of do-it-yourself
furniture. These type of screws are driven into pilot
holes with ordinary screwdrivers as shown in Fig. 5.

6.7 Hard wood dowels, 6 to 10 mm in diameter also
provide good means of making 'L' and 'T' joints.
Generally grooved hardwood dowels are used for this

IS 15932 (Part 1) : 2012

Wood Screw

Insert

Nylon Insert and
Wood Screw Joint

Fig. 4 Nylon Insert and Wood Screw Joint

t

\\\\\\\\\\\

Screw Connection

Fig. 5 Screw Connector

purpose. As a general rule the diameter of the dowels
may be half the thickness of the board to be joined and
length of the dowel may be five times thickness of the
board.

6.8 Nails shall only be used for nailing particle board
through the face into the wooden framework for
temporary use. Nails shall never be used for making
'L' and 'T' joints in particle boards.

7ADHESIVES

Woodworking adhesives based on polyvinyl acetate
(PVA) are suitable for use in strengthening the joints,
in lipping and in laminating with high pressure
laminates. The use of new generation adhesives for use
with particle boards may also be considered.

8 STACKING AND HANDLING

Particle boards are hygroscopic in nature and will thus
respond to variations in atmospheric temperature and
relative humidity. A change in moisture content affects
the dimensions and likely loss in the flatness. Improper
handling causes physical damages to the boards. Many
of the problems can be avoided by taking precautions
in handling and storage of particle boards. The
following precautions are needed in handling and
storing of particle boards:

a) Particle boards should be kept off the floor. A
pallet shall be placed on ground as base on
the floor.

b) The frame planks and wooden beams in pallet
should be of uniform thickness.

c) A pallet should be used between each metre
height of stack.

d) When loose wooden beams are used instead
of pallet, then the beams should be laid at
equal distance and the position of each beam
should fall in one vertical line.

e) A stack of particle boards shall be covered
with a weight on the top board. The weight
on top should not warp or bend the boards.

f) Boards should not be stored near open
windows or near open door during monsoon
or the windows should be kept closed.

g) Boards should be stored in a clear, covered
and dry place with proper ventilation.

9 WORKING OF MEDIUM DENSITY PARTICLE
BOARDS

9.1 Medium density particle boards have no definite
directional characteristics. Therefore, unlike wood,
particle boards can neither be ripped nor be cross cut
when sawed, regardless of direction. Particle boards
must be sawed by a combination of the two cutting
methods.

9.2 The conventional hand saw does not work well in
particle boards because of thermosetting resin used and
silica content in the raw material. Thermosetting resins
are somewhat abrasive and dull the steel saws rapidly.
It is therefore recommended to use tungsten tipped
carbide saw blades.

Chip load in the range of 0.08 to 0.13 mm per tooth is
recommended. Low chip loads result in a fine cut edge.
Chip load is the amount of material removed per tooth
and is related to the number of teeth on the blade, the
running speed and the material feed rate.

In order to get a side finish suitable for edge-bonding,
use of a scoring saw is a must. Such equipment is
otherwise required to avoid chip-offs.

9.3 The following guidelines shall be followed while
cutting:

a) Cutting speed should be a minimum of
4 500 rpm.

b) Use of a strudy machine with scoring blade
facility gives an edge surface suitable for edge
bonding and edges without any chip-offs.

c) Use of fine tungsten carbide tipped blade is
recommended.

d) The height of blade above the board surface
shall be maintained between 12 mm to 25 mm.

e) Support to the work shall be extended up to

IS 15932 (Part 1) : 2012

the position of the blade in order to obtain a
vibration free cut and to avoid chip-off s.

f) Boards shall be cut using sharp blades only.

g) When using hand saws, the following shall
be ensured:

1) Use of a thinner saw,

2) Use of fine tooth cross cut saw having a
tooth angle towards the operator, and

3) Material should not be cut at a right angle
position. The blade shall be at a minimum
angle position or should have a cutting
angle of less than 40°.

NOTE — A sharp saw tooth is to be maintained.

10 EDGE PROFILING AND FINISHING

10.1 Edges of particle boards can be profiled using
tungsten carbide tipped cutters fitted to spindle
moulding machine.

10.2 PVC edge bands specially made for particle
boards are widely used for factory produced items.
These are in wide range of colours and profiles that
match with the lamination. Special edge bending
machines are used to fix the bands using hot melt
adhesives. Veneer bands are also available for finishing
the edge of particle board.

10.3 For wood lipping, plastic laminates can also be
used to finish the edges using PVA and rubber based
adhesives. In plain particle board the edges can be
painted or lacquered, after sealing the edges with
sealants.

11 FINISHING

11.1 Plain particle board being absorbent in nature
should be sealed with a proprietary sealants and fillers.
The surface may be finished with pigmented finishes
based on alkydes, melamine and polyurethanes. They
can also be finished after sealing, staining with
lacquers based on nitrocellulose, polyurethanes and
melamines.

11.2 Plain particle board cabinets and table tops can
also be finished with high pressure laminates using PVA
or rubber based adhesives.

11.3 Veneered particle board may be finished using
the same methods used for finishing wood. Clear/
pigmented finishes, lacquers, varnishes or paints are
suitable for finishing veneered particle board.

11.4 The manufacturer's instructions should be
followed for preparation of the surface (with proper
use of abrasive paper) and sealing the surface with
sealers and primers.

12 FITTINGS FOR JOINERY

12.1 Numerous types of hardware are now available
for use with panel materials. Surface mounted hinges
are recommended for fixing particle board shutters in
manufactured items like cabinets, storage units and
wardrobes.

12.2 Slides, drawer glides and shelve supports are
specially available for panel materials to facilitate easy
fixing and avoid damage during fabrication.

12.3 Fittings like ex-centre wheel, corner blocks, mini
fix are ideal for making corner joints in knock down
and assembled furniture.

12.4 Fabricators should follow instructions given by
the manufacturers of the special hardware. They should
check the strength and wear and tear of such hardware
under prolong use.

13 APPLICATIONS

13.1 Particle board plain, veneered or prelaminated,
are ideal for making cabinets, furniture units, partitions,
door panel inserts and wardrobes. Veneered particle
board with phenolic resin bonded core can be used for
semi-structural applications like floor decking in air-
conditioned rooms. Perforated particle boards are
suitable to be used in suspended type false ceilings.

13.2 Generally, particle boards in thickness 20 to
25 mm are suitable for cabinets, built-in furniture,
partitions and floorings. Boards in the range of 9 to
12 mm are used as panel inserts, in ceiling, wall
panelling and for backing of cabinets. The relevant
Indian Standards on various types of door shutters
should be referred for use of particle board as panel
inserts.

13.3 Particle boards, plain, prelaminated and veneered;
are also suitable for making partitions, cabins and
workstations. Boards of 12 to 15 mm thickness,
supported by wood or metal framework should be
adequate for this purpose.

13.4 Particle boards are also useful for making mock
ups, settings, exhibition structures and other temporary
applications.

IS 15932 (Part 1) : 2012

ANNEX A

(Foreword)

COMMITTEE COMPOSITION

Wood and Other Lignocellulosic Products Sectional Committee, CED 20

Organization

Indian Plywood Industries Research & Training Institute,
Bangalore

Bamboo Society of India, Bangalore

Building Materials & Technology Promotion Council,
New Delhi

Central Building Research Institute, Roorkee

Central Public Works Department, New Delhi

Century Plyboard India Ltd, Kolkata

Coir Board, Bangalore

Directorate General of Supplies & Disposals, Hyderabad
Directorate of Standardization, New Delhi

Engineer-in-Chief's Branch, New Delhi

Federation of Indian Plywood & Panel Industry, New Delhi
Forest Research Institute, Dehradun

Housing and Urban Development Corporation, New Delhi
Indian Academy of Wood Science, Dehradun

Indian Plywood Industries Research & Training Institute, Bangalore

Institute of Wood Science & Technology, Bangalore
Jolly Board Limited, Mumbai

Kerala State Bamboo Corporation Ltd, Ernakulam
Kutty Flush Door & Furniture Co Pvt Limited, Chennai

Mangalam Timber Products Limited, Bangalore

Ministry of Defence (DGQA), Kanpur

Ministry of Defence (R&D), New Delhi
Ministry of Railways, Lucknow

National Mission on Bamboo Application, New Delhi
National Test House, Kolkata

Northern India Plywood Manufacturer Association, Jalandhar

Nuchem Limited, New Delhi

Permalli Wallace Limited, Bhopal

Representative(s)
Dr C. N. Pandey (Chairman)

Shri N. S. Adkoli

Shri a. S. Sadashivaiah (Alternate)

Shri J. K. Prasad

Shri A. K. Tiwari (Alternate)

Dr S. p. Acarwal

Dr B. S. Rawat (Alternate)

Shri Surinder Kumar

Shri S. K. Verma (Alternate)

Shri Aiay Baldawa

Shri Nikhilesh Roy Chowdhury (Alternate)

Shri M. Sudhakaran Pillai
Shri R. Vasudev (Alternate)

Shri M. Gangaraju

Dr (Shrimati) Indu Gupta

Shri G. K. Sharma (Alternate)

Shri N. B. Shelar

Shri Saniay Mittal (Alternate)

Shri Jayadeep Chitlangia

Director

Shrimati Maniu Safaya

Secretary

Joint Secretary (Alternate)

Shri K. Shyamasundar

Shri M. Venugopal Naidu (Alternate)

Director

Shri Arvind Jolly

Shri P. K. Das Gupta (Alternate)

Shri M. R. Anil Kumar

Col. G. Krishnan

Shri K. Shankarkrishnan (Alternate)

Shri G. S. Gupta

Shri R. Krishnan (Alternate)

Shri Nusrat Ullah

Shri K. C. Gupta (Alternate)

Shri Ravinder Kumar

Director

Assistant Director (Alternate)

Shri Sunil Pandey

Shri Alok De

Shri S. Thirumalai Kolundu (Alternate)

Shri N. K. Tiwari

Shri Anil Goel (Alternate)

Shri Sudev Barar

Shri Jitesh Nichani (Alternate)

Shri S. K. Kadesia

Shri B. S. Parmar (Alternate)

IS 15932 (Part 1) : 2012

Organization
Rajiv Gandhi Rural Housing Corporation Ltd, Bangalore
Tlie Soutli Indian Plywood Manufactures Association, Chennai
The Western India Plywood Limited, Kannur

Timber Development Association of India, Dehradun
Timpack Pvt Limited, Byrnihat
BIS Directorate General

Representative(s)

Shri Mahadeva Prasad

Shri K. Sankarakrishnan

Shri P. K. Mohamed

Shri K. Raghunathan (Alternate)

Representative

Director

Shri A. K. Saini, Scientist 'F' & Head (CED)
[Representing Director General {Ex-officio}]

Member Secretary
Shri J. Roy Chowdhury
Scientist 'E' (CED), BIS

Wood, Other Lignocellulosic Based Building Boards and Speciality Wood
Products Subcommittee, CED 20 : 6

In personal capacity (573, 23rd Cross, 13th Main, Banashankari
2nd Stage, Bangalore 560070)

Arunachal Plywood Industries Limited, Kolkata

Bharat Heavy Electricals Limited, Piplani

Central Building Research Institute, Roorkee

Central Institute of Coir Technology, Kalavooor

Coir Industrial Products Co-operative Society Limited, Bangalore

Central Public Works Department, New Delhi

DGS&D, New Delhi

ECO Board Industries Limited, Pune

Engineer-in-Chief's Branch, New Delhi

Federation of Indian Plywood & Panel Industry,New Delhi

Indian Plywood Industries Research and Training Institute, Bangalore

Forest Research Institute (Forest Products Division), Dehradun

Godrej & Boyce Manufacturing Company Limited, Mumbai

Indian Plywood Industries Research & Training Institute, Bangalore

Institute of Wood Science and Technology, Bangalore

Integral Coach Factory, Chennai
Jolly Board Limited, Mumbai

Dr H. N. Jagadeesh (Convener)

Shri M. M. Jalan

Shri J. Prashad (Alternate)

Shri M. V. Prabhakar

Shri S. K. Gupta (Alternate)

Shri B. Singh

Shrimati Manorama Gupta (Alternate)

Shri M. Sudhakaran Pillai

Sffiii John Sudhir

Shri Vuay Ghorpade (Alternate)

Superintending Engineer

Executive Engineer (Alternate)

Shri N. K. Upadhyay

Shri V. S. Raiu

Shri S. P. Sethi (Alternate)

Shrimati P. Meenakshi

COL N. A. Kumar (Alternate)

Shri Arvind Jolly

Shri Moiz S. Vagh (Alternate)

Shri M. Venucopal Naidu

Shrimati. D. Suiatha (Alternate)

Head of Department

Dr S. P. Khali (Alternate)

Shri Girish V. Nalavade

Shri Manubhai M. Shah (Alternate)

Dr S.K. Nath

Shri M. Venugopal Naidu (Alternate)

Dr R. V. Rao

Dr Ajay Karmakar (Alternate)

Representative

Shri Arvind Jolly

Shri P. K. Das Gupta (Alternate)

IS 15932 (Part 1) : 2012

Organization
Kerala State Bamboo Corporation, Cochin
Kutty Flush Doors & Furniture Co Pvt Limited, Chennai

Mangalam Timber Products Limited, Kolkata

Ministry of Defence (DGQA), Kanpur

Ministry of Defence (R&D), Kanpur

Ministry of Railways, Lucknow

Natura Fibretech Pvt Limited, Bangalore

NCL Industries Limited, Hyderabad

North India Plywood Manufacturing Association, Jalandhar

Novopan India Limited, Hyderabad
Nuchem Limited, Faridabad

Permali Wallace Limited, Bhopal

The Gurdit Institute Pvt Limited, Dharwad

The Mysore Chipboards Limited, Mysore

The South Indian Plywood Manufacturers' Association, Kottayam

The Western India Plywood Limited, Kannur

In personal capacity (5/6, 1st Floor, 13th Main, HAL, 2nd Stage,
Indira Nagar, Bangalore 560 008)

Representative(s)

Shri M. R. Anil Kumar

Shri K. Sankarakrishnan

Col Y. G. Krishnan (Alternate)

Shri G. S. Gupta

Shri R. Krishnan (Alternate)

Shri Nusrat Ullah

Shri K. C. Gupta (Alternate)

Shri P. S. Srivastava

Shri Ravindra Kumar (Alternate)

Deputy Director Standards

Assistant Director (Alternate)

Shri Tommy Mathew

Shri Sunil Vargeese (Alternate)

Shri M. Krishna Prasad

Shri Prakash Raju (Alternate)

Shri Surinder Arora

Shri Naresh Tiwari (Alternate)

Shri S. A. Naqui

Shri Sudev Barar

Shri Jitesh Nichani (Alternate)

Shri S. K. Kodesia

Shri B. S. Parmar (Alternate)

Shri Yaskaran Singh Lauly
Shri P. Hosmai (Alternate)

Shri A. Ananthachar

Shri K. Sankarakrishnan
Secretary (Alternate)

Shri K. P. Kamaluddin

Shri C. A. Gafoor (Alternate)

Shri P. K. Bagchi

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harmonious development of the activities of standardization, marking and quality certification of goods
and attending to connected matters in the country.

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implementing the standard, of necessary details, such as symbols and sizes, type or grade designations.
Enquiries relating to copyright be addressed to the Director (Publications), BIS.

Review of Indian Standards

Amendments are issued to standards as the need arises on the basis of comments. Standards are also reviewed
periodically; a standard along with amendments is reaffirmed when such review indicates that no changes are
needed; if the review indicates that changes are needed, it is taken up for revision. Users of Indian Standards
should ascertain that they are in possession of the latest amendments or edition by referring to the latest issue of
'BIS Catalogue' and 'Standards : Monthly Additions'.

This Indian Standard has been developed from Doc No.: CED 20 (7608).

Amendments Issued Since Publication

Amend No. Date of Issue Text Affected

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Eastern : 1/14 C.I.T. Scheme VII M, V. I. P. Road, Kankurgachi f 2337 8499, 2337 8561

KOLKATA 700054 \ 2337 8626, 2337 9120

Northern : SCO 335-336, Sector 34-A, CHANDIGARH 160022 J 60 3843

60 9285

1^

Southern ; C.I.T. Campus, IV Cross Road, CHENNAI 600113 f 2254 1216, 2254 1442

\_ 2254 2519, 2254 2315

Western : Manakalaya, E9 MIDC, Marol, Andheri (East) f 2832 9295, 2832 7858

MUMBAI 400093 \ 2832 7891, 2832 7892

Branches: AHMEDABAD. BANGALORE. BHOPAL. BHUBANESHWAR. COIMBATORE. DEHRADUN.
FARIDABAD. GHAZIABAD. GUWAHATI. HYDERABAD. JAIPUR. KANPUR. LUCKNOW
NAGPUR. PARWANOO. PATNA. PUNE. RAJKOT. THIRUVANANTHAPURAM.
VISAKHAPATNAM.

Published by BIS, New Delhi